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Flatworms

Animals with bilateral symmetry, 3 germ layers, organ systems and distinct heads.

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Invertebrates: Species Study Guide
Student Contributed
This study guide summarizes the ecology, body structure, and reproduction of sponges, cnidarians, flatworms, roundworms, mollusks, annelids, arthropods, insects, and echinoderms. It also includes further classification of arthropods and echinoderms.
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